/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.crunch.impl.spark.collect;
import org.apache.crunch.impl.dist.collect.BaseUnionCollection;
import org.apache.crunch.impl.dist.collect.PCollectionImpl;
import org.apache.crunch.impl.spark.SparkCollection;
import org.apache.crunch.impl.spark.SparkRuntime;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaRDDLike;
import org.apache.spark.storage.StorageLevel;
import java.util.List;
public class UnionCollection<S> extends BaseUnionCollection<S> implements SparkCollection {
private JavaRDDLike<?, ?> rdd;
UnionCollection(List<? extends PCollectionImpl<S>> collections) {
super(collections);
}
public JavaRDDLike<?, ?> getJavaRDDLike(SparkRuntime runtime) {
if (!runtime.isValid(rdd)) {
rdd = getJavaRDDLikeInternal(runtime);
rdd.rdd().setName(getName());
StorageLevel sl = runtime.getStorageLevel(this);
if (sl != null) {
rdd.rdd().persist(sl);
}
}
return rdd;
}
private JavaRDDLike<?, ?> getJavaRDDLikeInternal(SparkRuntime runtime) {
List<PCollectionImpl<?>> parents = getParents();
JavaRDD[] rdds = new JavaRDD[parents.size()];
for (int i = 0; i < rdds.length; i++) {
rdds[i] = (JavaRDD) ((SparkCollection) parents.get(i)).getJavaRDDLike(runtime);
}
return runtime.getSparkContext().union(rdds);
}
}